Sectional block conduit



Sept. 0 J. J. DIMMENDAAL 2,521,351

SECTIONAL BLOCK CONDUIT Filed July 9, 1947 I I III I /L/ ET 7 r, 4 2 1 37 nvv ENTOR 15 0% c 05 (MN D/MMi/VDAAL Patented Sept. 5, 1950 Eh PATENTother:

7 2,521,351 :SEGTiONAL BLOCK ooNnorr Jacob Jan hiinnienuaal,EileeomfNethe-ri'ands d s lioationooiys, 1947, seria1 No; 759,830

r in the Netherlands March 10, 1-943 seetigh rutheiiaw s90, A gust's,1946' ratent expires Mareh it, meg

The invention relates to a prooess for o'" he at their edges a "pair orslab sha ed eonsis'ting of wire armoured fibrouseement, soon a asbestoscement.

It is "an object "of the invention to provide fior a novel method formarinfaoturing hoiiow bodies, such as conduit "elements adapted to eusedin chimneys and in heating and ventilating than neis. Up to the presentsuch-eonduit eiements have been inanufaoturedby plating around 'a inoida slab of a desired width ih theiresh, "p es tie eon'dition, closing theIongitud'iha1;'s'eain thus obtained by ramming or knocking and removingthe mom after the materia as sumoientiy hardtene'd, after which the"oonduiteienient must still be cured during a 'eoiisi'derable soaoe "of"time about six weeks) before it "is ready for use.

The seam of such-eonduit elements shows the disadvantage that the'armouring is interrupted at that'plaee so that the seameons 'tes a weakspot in the oomiu'it element. A -further di advantage of the above knownh'ro'oess i-ies in that it is rather time consuming, so that "deliverytakes a' -lorrg time This drawback may be met by keeping a store ofconduit elements of the usual sizes, but this measure does-not-.-provide a solution for such frequent cases when conduit elements ofunusual-sizeand shape are required.

It is an object of the invention toproyide for a method of manufactureof conduit eiem'ents and similar hollow bodies whereby weak spots attheseams are avoided. A further object is to enable a rapid delivery to bemade of conduit elements the like in any desired size and shape.Furtherobjects areto diminish the hosts of manufacture and"transportation of eonduit elements and similar hollow bodies. 7

Another object of the invention is to 'pr'o'vide for a sirnnie andinexpensive metho'd for joining a air 6f slabs of wire armoured fibrousoement.

still another object i to obtain "a speeial pro teetioh fo'r "the edgesota eonduit element, 'where by the eie'ment is -'made snore resistantagainst fiexu're "and the number of supports of a conduit may bediminished. A iur ther obiectis to provide ro'r -'a conduit -'eiem entwhich oan he laeed oiose to "waiter a buildin'g.

Aoc'oi'd- "g to the inventiona joint hetweentwo slab shaped partsconsisting of wire armoured fibrous oement is nside b'y laying open thearrhouring hyreinoval of the fib'rbiis eemen't -a't the edges to hejoined, eonh'eoting 'together the armourine w es p'rojeeti'n" om one ofthe said parts 'eah with an ar ing *w .e p meeting from the other oart,e. g. by eminent-twisting.

e-olaims. (o1. rte- 81) fillin u the gap remaining between "the saidparts with mortar, and finishing ofi theseam ob"- tained in this mannerhetween the Said parts. The removal the fibrous 'tement at the edges mayhe efieeted by hui-verization. When the parts to be joined enoioseanangle he'tween them it preferable to p idea acking material, forinstance a bitumen or similar packing cord in the gap between the partsbefore connecting to- 'gether err-mowing wi-r'es. packing niaterial isfirmly pressed ag a'i St the "ed-g e's of the parts to be joined by thetwisted tor -welded wires, so that :a very tight joint is obtained.

In a preferred embodiment of the invention conduit elements or similarhollow bodies are manufactured out of a lura l ity or prefabricatedslabs of wire armoured fibrous cement by s'a'wing the slabs the desireddimensions and joining them in the above described manner. Corrdu'itelements and the like may thus be man-ufa'ctured in a very short timefrom slabs in store, so that the time of delivery is considerablyshortened. Moreover, the wooden mold is no longer necessary, which meansa welcome cut'in cost price. I

In another embodiment of the invention "conduit elements and the likeare manufactured out of one prefabricated slab of wire armoured fibrousoemeht "by laying open the armouring by removal of the fibrous cement atleast "at 'two opposite --edges or "the slab and alon ap1ura1ity oflines running across the slabjbendin'g theslab so as to place the saidedgesalongside'eachro'ther, joining the edges by means of the abovedescribed inet'ihod and filling up the gaps remaining at the sa'i'dlin'es with mortar. For tightening the" seams use mayfbe made of apacking cord or "the like as mentioned above.

In the manufacture of eonduit elements "and the like the inventionoffers "an o portunity "for econorniaing on transportation expenses hymaking the required conduit elements in situ,'so that the slabs'may betransported to the "bui'li'li'n'g "site as "fiat iying material. Thesflabs may be sawn to "the "desired dimensions "at the works. Anotheradvantage "is,itl1"at the "finishing 'o'ff fdffth'e conduit "elementsmay be e'ffeeted on .thebui'ld i'n'gsite. Modifications of pipesystemconsi'sting of conduit elements according to t'he inventionmay "bereadily made without enydifiio'uhy.

'In1':iratising the invention a special =1orotec= tion of the edges ofthe conduit elements is preferabiy obtained by fitting a filuraiity ofushapedgiiiding menibers around the-edges of eaeh of the slabsconstituting the conduit element in such a manner, that the externallegs of these guiding members are spaced with respect to the surfaces ofthe slabs and by providing for a plurality of corner fillets eachenclosing one of the edges and provided with channel shaped edges whichslide over the said guiding members. In this manner an efficientprotection of the vulnerable edges of the conduit element is obtained.At the same time a neat appearance of the conduit element is obtainedand the strength thereof is considerably increased. More particularlycorner fillets of the described construction may be used at the jointsbetween two conduit elements instead of the usual sleeve joints. Thusthe number of supports may be considerably decreased, as incontradistinction to sleeve joints, not every corner fillet demands asupport. Corner fillets may also be provided over the full length of theconduit element, in which case the corner fillets are preferably carriedout so as to telescope at their ends.

As the dimensions of the joint do not exceed those of other portions ofthe conduit element, the element may in contradistinction to theconduits now in use be placed close to a wall.

The invention will be more readily understood by reference to theaccompanying drawing, in which Fig. 1 represents a prefabricated slab ofwire armoured fibrous cement.

Fig. 2 represents the same slab after sawing to the required dimensionsand removing the fibrous cement at the edges.

Fig. 3 shows a conduit element according to the invention and part of anadjoining conduit element.

Fig. 4 shows another conduit element according to the invention. I

Fig. 5 shows an embodiment of the invention, in which a specialprotection for the edges has been provided, and

Fig. 6 shows a detail of the construction of Fig. 5. g

In Fig. 1 a slab of wire armoured fibrous cement, e. g. asbestos cementof standard length and width is shown. In order to make a conduitelement, four of such slabs are sawn off along the line aa so that theirwidth corresponds to that of the required conduit element. Each of theslabs is then stripped of its fibrous cover along two opposite edges, sothat the armouring wires project as shown at I in Fig. 2. The four slabsare then placed in such a position, that each, slab is perpendicular tothe two adjacent ones, as shown in Fig. 3. 'A bitumen cord 2 is placedinto each of the gaps remaining between the slabs. After that the slabsare interconnected by twisting the projecting armouring wires as shownat 3, the ends of the armouring wires are bent over and pressed into thegap and the gaps are filled up with fibrous mortar. Finally the fourscams or joints obtained at the edges of the conduit element arefinished off. A joint between two conduit elements may be made in thesame manner as indicated at 4 in Fig. 3. For this pur-' pose the fibrouscement is likewise removed by pulv'erization or the like at the edges tobe joined, the projecting armouring wires are interconnected bytwisting, and the ends of the wires are pressed into the seams, afterwhich the remaining gaps are filled up with mortar and finished ofi.

Fig. 4 shows a conduit element with a dome shaped section. In order tomanufacture this conduit element a slab 5 is provided with a pluralityof grooves 6 on both sides of the armouring and bent along thesegrooves. At two opposite edges of the slab the fibrous material isremoved so as to lay open the armouring, after which the uncoveredarmouring wires are twisted together with the uncovered armouring wiresof a bottom slab 1. Of course it is also possible to connect both endsof such a grooved slab together, so that a conduit element ismanufactured out of a single slab. After that, the remaining gaps arefilled up with mortar and finfillets for protection of the edges.

ished off.

' Fig. 5 represents a perspective view of two portions of a conduitprovided with special corner One of the corner fillets has not yetobtained its final position. Two conduit elements H and [2 aremanufactured out of asbestos cement slabs in the above described manner;the slabs I3 being connected together by twisting. the projectingarmouring-wires Id. The elements II and I2 are interconnected in thesame way. U-shaped iron guiding members l5 and r5 are'fitted at somedistance from each other around the slabs 13. The twisted armouringwires [4 prevent the guiding members from moving along the edge. Acorner fillet H, with channel shaped inwardly bent edges [Band [9, as,shown in Fig. 6, is slid over the guiding members in such a manner, thatthe edge l8 fits around the external legs of the guiding members [6,.and the edge l9 fits around the external legs of the-guiding members 15.By shoving along the corner fillet H along the edge of the conduitelements, the elements II and 12 are firmly connected together. 7

In order to facilitate the positioning of the corner fillets, thechannel shaped edges thereof may be provided with recesses each adaptedto pass sideways over one of the guidingelements. Thus the corner filletcan be placed around an edge of the, conduit element by passing theserecesses each over one of. the guiding elements, and then sliding thecorner fillet along the edge over some distance.

Modifications, such as branchings of a .pipe line consisting ofconduit'elements as are shown in Figs. 5' and 6, are readily made bypushing away the cornerfillets and laying open the armouring at theeasily accessible edges of the conduit element. The twisted armouringwires may then be cut, the fibrous cement be pulverized so as to removeapart of a slab, and new slabs be added by twisting together, thearmouring wires of the oldand the new'slabs, filling up the remaininggaps with mortar'and; finishing ofi.

l. A conduit element, comprising a plurality of slab shaped partsconsisting of wire armoured fibrous cement, a pluralit of armouringwires embedded in each of the said parts and projecting therefrom atleast at two opposite edges, meansfor interconnecting said slabs at theedges thereof comprising the said projecting armouring,

wires connected together each with armouring wires projecting fromadjacent edges, a plurality of U-shaped guiding members fitted aroundeach of the said edges, theexternal legs of the said members beingspaced in relation to the outer surfaces of the said parts, a filling ofmortar in each of the gaps between adjacent ones of the said parts, anda plurality of corner fillets each enc1osing a. joint between twoadjacent ones of thesaid parts, 'th,e ,saidcornerfillets being providedwith channel shaped edges adapted to he slid over the said guidingmembers.

2. A conduit element as claimed in claim -J wherein the said channelshaped edges of at. least one of the said corner fillets are providedwith a plurality of recesses each adapted to pass; sideways over one ofthe said guiding members whereby the corner fillet can be placed aroundthe said joint by passing the said recesses each over one of the saidguiding members and then sliding the corner fillet along the said jointfor some distance.

3. In combination, two conduit elements as claimed in claim 1, placed incoaxial alignment behind each other, wherein at least one of the saidcorner fillets of one of the said conduit elements is adapted totelescope over the corre- 5 spending corner fillet of the other one ofthe said conduit elements.

' JACOB JAN DIMMENDAAL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 10 Number Name bate 1,278,111 Cummings Sept; 11,1918 2,004,936 Born at al. June;f.18, 1935 OTHER REFERENCES ConcretePlain 8a Reinforced, by Taylor and Thompson, published by John Wiley &New York, 1909. (Copy in Division 15.)

